Motor compressor unit



March 5, 1929.

H. E. CRANE MOTOR COMPRESSOR UNIT Filed- March 17, 1927 2 Sheefs-Sheet l IN VEN TOR Han/ex E. Cm we BY mm A TTORNE Y March 5, 1929. H. E. CRANE 5,704,655

MOTOR COMPRESSOR UNIT Filed March 1'7, 1927 2 Sheets-Sheet 2 INVENTOR Ha rve E. Crane mm W A TTORNE Y Patented Mar. 5, 1929.

UNITED STATES 1,704,655 PATENT OFFICE.

HARVEY E. CRANE, 0F FORT WAYNE, INDIANA, ASSIGNOR TO THE HOOVER COMPANY,

A CORPORATION OF OHIO.

MOTOR COMPRESSOR UNIT.

'REISSUED Application filed March 17, 1927. Serial No. 175,975.

The object is to provide an improved gas compressing machine particularly adapted for use in connection with refrigerating systems; the invention disclosed relates particularly to the arrangement and constructlon of the compressor and the motor for drivlng the compressor.

A further object of the invention 1s to provide a fully enclosed motor compressor unit whereby the usual stufiing box about the compressor shaft to prevent leakage therearound may be dispensed with, or 1n other words, to provide an arrangement in WhlCh there are no moving parts exposed to the atmosphere which might need anything in the way of packing to prevent gas leakage.

A still further ob ect of the lnvention 1s to provide a gas compressing'unit wherein the motor and compressor are mounted upona central main casting or frame through wh1ch all connections to and from said unit pass thereby permitting said unit to be made up and tested in full view before sealing.

A further object of the invention is to provide means in a motor compressor unit wherein all major parts are rigidly connected so that there will be no tendency for one part of the unit to become dislocated with respect to any of the others.

The objects of this invention are accomplished by employin a frame member which forms the support or both the motor and compressor of the unit and the other related parts of the motor compressor mechanism and to which frame are secured closures or domes by means of which the motor compressor unit is completely enclosed in an air-tight manner in order that gas under compression may not leak from the system nor air leak thereinto.

arranged within this frame so that there will be no danger of disruption thereof due to relative movement between the domes and said frame member.

In the drawings Figure 1 shows a complete motor compressor unit suitable for use in connection w th refrigerating machines, the showing being in section substantially on lines 1-1 of Fig. 2 'Fig. 2 is an end view of Fig. 1 with the outer dome moved and with certain parts left out for clearne ss of illustration, the view being taken from the compressor end of the unit.

The gas ports for the compres-' sor and all electrical leads are preferably Casting 12 is approximately U-shaped and the outer overhanging portion 15 thereof serves as an outer bearing support for the motor shaft.

It is to be understood that the main frame as above described may be made as a single piece if its design is not such as to make it difficult to cast as a single member, and that it is not necessary that the main frame 10 be limited to two major portions such as is specifically illustrated. The main frame may also comprise a major portion and several minor portions, the object of this invention being to provide a construction wherein the entire machine is supported from a main frame and not to provide a specific form of main frame support.

Mounted in casting 12 and therefore supported in casting 11 because of that connection existing between the castings, there is a motor shaft 16 which carries the motor-rotor 17 mounted on one end thereof, and also on the other side of the main bearing there is mounted on said shaft, an eccentric 18 for operating the pistons 19 of the compressor. Shaft 16 extends through and beyond the outer bearing formed in the outer portion 15 of the U-shaped frame member, and here is mounted a centrifugal compressor unloading device 21.

Cylinders 20 are mounted in bores of the frame casting 12 and as shown are of the oscillating type. It is not necessary that the compressor cylinders be of the particular type disclosed'and the compressor may be of any desired type so long as it is supported on main frame assembly 10 and not on some part unconnected therewith so that there might be relative movement between the main frame and the compressor mounting.

As a part of frame member 12 there is provided a valve housing from which pipes lead as indicated at 22 and 23, these pipes being the high pressure pipes which lead from the valve casing 24 and connect to the main frame 11 at 25 and 26 discharging into passages therein which open therethrough at 27 and 28 for the discharge of high pressure gas, for instance, into the condenser of a refrigerating system.

A muffler for the compressed gas is incorporated in connection with the valve casing 24,-and is indicated generally by numeral 29. The pipe-30 leads from the valve casing 24 to a pressure equalizing valve 40, so that when the machine stops the pressures throughout the system may equalize.

Suction gas is permitted to enter the unit through conduit 41 which may be connected,

' through pipe 42, to the expansion coils of a refrigerating system. The suction ports for the cylinders 20 are shown at 43, which of course take in such gas which enters the chamber formed by the domes 32.

The unit as thus far desc-ribedwill comprise a complete motor compressor unit which may be operated as such, the entire unit being mounted on a central frame with the motor projecting from one side thereof and the compressor from the other side thereof. Two domes 32 are provided for inclosing this apparatus, one to be placed over the motor side of the unit and the other over the compressor side of the unit. These domes .may be secured to the main frame 11 through a series of bolts, one of which is shown at 33 as passing through the holes 34. However, the joints between these domes and the main frame 11 should form a gas tight seal.

Fins 35 are provided upon the enclosing domes 32 in order that the heat generated by the motor-compressor unit may be more readily dissipated.

Main frame casting 11 is provided at its bottom part with integral ears 36 to which may be secured anglermembers such as 37 whereby the entire unit may be mountedupon an appropriate base.

It will be seen that there has been provided a motor compressor unit which is very rugged in construction and one wherein there is the minimum liability for the parts to become disarranged. It is further apparent that during operation of this unit the domes 32 form a chamber for receiving the suction gas and that the motor and compressor units operate within this gas medium, for instance the suction gas enters the chamber formed by that dome 32 which incloses the compressor unit through conduit 41, and the compressor unit takes the gas therefrom through suction ports 43. That dome 32 which incloses the motor prevents the escape of any gas which may leak through the main bearing 13.

It is obvious that an arrangement of pipmoacae ing m ght be provided to connect the conduit 41 with the suction ports 43, then the domes 32 would serve merely to prevent the escape of any gas which might leak from the compressor; or as another modification the pipes 22 and 23 might be eliminated, under which condition the exhaust side of the compres-' sor would open into the chambers formed by that dome 32 which incloses the compressor unit, and finally be carried ofi, for instance to the condenser of a refrigerating machine, through pipes 27 and 28; the compressor then operates in a gas medium of high pressure. However, in either modification there are no moving parts exposed to the atmosphere which might need packing to prevent leakage.

One of the great advantages of a construction such as has been described is that the mainframe 10 may be set up complete without the domes 32 but with the motor and compressor attached, and the unit may be run in this condition to determine its fitness for the market; or in case the unit may need repairing it is merely necessary to remove either of the domes 32, as the case may require, and suitable repairs and operating tests may readily be made. 1

By having the entire machine built up on the central casting 10 and placing the dome 32 over the motor and compressor, it is possibleby sealing these domes to provide a connation of a main supporting frame, a motor.

mounted on one "side of said frame, a compressor mounted on the other side of said frame, and a closure member mounted on each side of said frame and forming two separate chambers in which the motor and compressor are located respectively.

3. A motor compressor unit comprising in combination a central main frame, closure members secured to each side of said frame and forming two distinct chambers, a motor located in one of saidchambers and a compressor in the other, said motor and said compressor being supported entirely by said. frame.

4. In a gas compressing machine the combination of a main frame member comprising a support for both a primemover and a compressor and closure members in sealed V and a compressor on the other, closure members in sealed relation with said frame member forming individual chambers housing said motor and said compressor and conduits passing through said frame member and connecting said chamber housing the compressor with the exterior.

CERTIFICATE OF CORRECTION.

Patent No. 1, 704, 655.

, 6. In a motor compressor unit the combination of a main supporting frame, a motor carried by said frame, a compressor carried by said frame and operablyconnected to said motor, gas conduits formed in said frame to convey gas to and from said compressor and enclosing members sealing said motor and said compressor in individual'chambers on opposite sides of said frame. v

Signed at Fort Wayne, in the county of Allen, and State of Indiana, this 2nd day of March, A. D. 1927.

HARVEY E. CRANE.

March 5; 1929.

H RVEY E. CRANE.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, i1ne 107 claim 1 after "motor" insert the words and compressor; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 6th day of September, A. D. 1932.

(Seal) M. J. Moore, Acting Commissioner of Patents. 

